Unable to publish to PDF X6 Home and Student

For the past few years I have had no problem publishing to PDF or saving to PDF. Now all of a sudden, it will only publish a single page on a multiple A4 sized presentation and if I try on a large design, it will only publish a small square of it.

As this is H&S I am aware that there are no settings available. I have noticed that twice previously someone has had the same problem but they never got an answer. I really hope someone can help with this because if I cant publish I am screwed. My only alternative I can see for the multi page is to publish all 27 pages separately, transfer to Photoshop and publish from there which is a bit of a ball ache. With the large billboard...I have no idea!

Please help!!!!